Add show command

brood/src/commands/show.rs

@@ -0,0 +1,79 @@
+use std::{io, path::Path};
+
+use thousands::Separable;
+
+use crate::{
+    data::Data,
+    util::{self, TitleNormalizer},
+};
+
+/// Show info about a specific article.
+#[derive(Debug, clap::Parser)]
+pub struct Cmd {
+    title: String,
+}
+
+impl Cmd {
+    pub fn run(self, data: &Path) -> io::Result<()> {
+        let normalizer = TitleNormalizer::new();
+
+        println!(">> Import");
+        let data = Data::read_from_file(data)?;
+
+        println!(">> Locate article");
+        let mut node = util::locate_title(&normalizer, &data, &self.title);
+
+        loop {
+            let page = &data.pages[node.usize()];
+
+            const W_LABEL: usize = 12;
+            const W_NUM: usize = 11;
+
+            println!();
+
+            println!("{:>W_LABEL$}: {}", "Title", page.title);
+
+            println!(
+                "{:>W_LABEL$}: {}",
+                "Title (norm)",
+                normalizer.normalize(&page.title)
+            );
+
+            println!("{:>W_LABEL$}: {}", "Redirect", page.redirect);
+
+            println!("{:>W_LABEL$}: {:>W_NUM$}", "ID", page.id);
+
+            println!(
+                "{:>W_LABEL$}: {:>W_NUM$}",
+                "Length",
+                page.length.separate_with_underscores()
+            );
+
+            println!(
+                "{:>W_LABEL$}: {:>W_NUM$}",
+                "Links (out)",
+                data.graph
+                    .edge_range(node)
+                    .len()
+                    .separate_with_underscores()
+            );
+
+            println!(
+                "{:>W_LABEL$}: {:>W_NUM$}",
+                "Links (in)",
+                data.graph
+                    .edges()
+                    .filter(|(_, target)| *target == node)
+                    .count()
+                    .separate_with_underscores()
+            );
+
+            node = match data.redirect_target(node) {
+                Some(target) => target,
+                None => break,
+            };
+        }
+
+        Ok(())
+    }
+}